[FFmpeg-devel] pre discussion around Blackfin dct_quantize_bfin routine
Tue Jun 12 19:24:04 CEST 2007
Btw.: Do you know of debian or SuSE packages for the compilers and stuff
needed for blackfin? As probably everyone knows by now, my main (gentoo)
development box (the laptop I also had at LinuxTag) is probably dead
forever so I can't do things the easy way right now :-(
On Tue, Jun 12, 2007 at 11:47:33AM -0400, Marc Hoffman wrote:
> unsigned long long read_time (void)
you must really like typing if you don't use just uint64_t *g*
> unsigned long long t0;
> unsigned lo,hi;
> asm volatile ("%0=cycles; %1=cycles2;" : "=d" (lo), "=d" (hi));
> t0 = lo;
Just out of curiousity:
can the compiler handle "=d" (t0) ?
getting rid of the seperate lo in some way removes one possibility for
the compiler to mess up...
> t0 |= (unsigned long long)hi << 32;
> return t0;
And how about doing
return lo + (uint64_t)hi << 32;
I personally would just only 32 bit instead of the ugly union
construct, at least until the compiler is fixed...
More information about the ffmpeg-devel